Parallel Girders

Hey Scott,
Would it be possible to have two side-by-side girders instead of one centralized girder? The hope is that by doing this the overall depth of each girder could be less. Treating it kinda like two parallel bridges. The columns would stagger back and forth along the two center lines, ideally without having to add more columns. Its sort of a combination of a single box girder and multiple beams.